Season meat with garlic powder; place in slow cooker. Add beer and 1/2 cup barbecue sauce; cover with lid. Cook on LOW 8 to 10 hours (or on HIGH 4 to 5 hours). Meanwhile, mix mustard, sugar and vinegar until blended. Add to coleslaw blend in medium bowl; mix lightly. Refrigerate until ready to serve.
Transfer meat to cutting board. Discard all but 1/4 cup sauce from slow cooker. Pull meat into shreds with 2 forks. Add to reserved sauce in slow cooker; stir in remaining barbecue sauce.
Fill rolls with meat mixture and coleslaw just before serving.
Substitute beef broth or apple cider for the beer.
Prepare using KRAFT Pepper Jack or Sharp Cheddar Cheese Slices.